Active Autowerke GESI Catted Downpipes - F90 M5 | F9X M8

For over 30 years, Active Autowerke has set the benchmark for BMW performance. Built on precision engineering and relentless innovation, our mission is simple — extract every ounce of potential from your BMW. The latest addition to the F90 M5 collection, these S63TU downpipes are designed to unleash your M5’s true power. By removing the restrictive factory bottlenecks, they dramatically reduce heat and turbo lag while delivering noticeable gains in horsepower and torque across the entire RPM range. Each set is manufactured in-house in Miami, Florida from TIG-welded 304 stainless steel and inspected for perfect fitment. The design features a factory-matched 3.5” V-band inlet that tapers into a high-flow, mandrel-bent body, including the lower “mid-pipe” section many others sell separately. The system retains the OEM O2 sensor heat shield, keeping your engine bay clean and stock-looking for a stealth, sleeper appeal. This version includes a pair of 4.5” GESI Ultra High Output (UHO) catal